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  1. Distance of Sun, Moon and Planets
  2. Ocean Jasper
  3. Alberta, Reserve, c1890
  4. Good Grades and Good Health Go Together - WPA Poster
  5. Civil War, Texas Rangers, 1861
  6. Bouncing ball
  7. Lena Delta - USGS Earth as Art
  8. Normal shoulder, X-ray
  9. Spilled Paint - USGS Earth as Art
  10. Artist's Rendering Of A Solar System
  11. The bones of the pelvis
  12. Abraham Lincoln, 1809
  13. Wingate Pass Agate, Ca
  14. Meandering Mississippi - USGS Earth as Art
  15. Base of human skull, inferior view, with labels
  16. 'Rheumatoid arthritis of the hands, X-ray
  17. Scrooge Objects to Christmas. Illustration for the novella A Christmas Carol
  18. Signature of John Hancock
  19. Florence Nightingale (1820-1910) illustration from World Noted Women
  20. Photomicroscopic close up of a snowflake crystal
  21. Capitol From the Botanical Gardens
  22. Microscopic view of bacteria
  23. Molecule Cinnamon
  24. Bears
  25. Normal hip, X-ray
  26. Illustration By Arthur Rackham From Grimm's Fairy Tale, The Cunning Little Tailor
  27. Bright Periodic Table - White, Classic Text
  28. Denver, Colorado, 1859
  29. The sun sets behind a row of spinning windmills or wind turbines
  30. Dental X-ray
  31. Mathematical Elements IV
  32. Portrait of Patrick Henry (1736-99)
  33. Solar System II
  34. Faridun's Sons Marry the Three Daughters of Sero. Shahnameh. The Book of Kings
  35. Replica Of Eli Whitney's Cotton Gin
  36. Winston Churchill (1874-1965) in Naval Scene
  37. Australia, Northern Territory, Arnhem Land, Mt Borradaile, rock paintings
  38. Pennsylvania, Gettysburg, Battle of Gettysburg, tree and battlefield monument, dawn
  39. Shame may be Fatal - WPA Poster
  40. The Teacher
  41. A Pawnee Brave
  42. Arteries of the brain, 3D CT scan
  43. Mexican Revolution (1910-19). Train with wounded revolutionary fighters
  44. Mistletoe - Botanical Illustration
  45. School supplies
  46. Martin Luther King, Jr. (1929-1968)
  47. Vintage American History painting of Alexander Hamilton
  48. Pair of human hands on black background.